[外语类试卷]大学英语六级改革适用(阅读)模拟试卷232及答案与解析.doc
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1、大学英语六级改革适用(阅读)模拟试卷 232及答案与解析 Section A 0 Once they decided to have children, MiShel and Carl Meissner tackled the next big issue: Should they try to have a girl? It was no small matter. MiShels brother had become blind from a hereditary (遗传的 ) condition in his early 20s, and the Meissners had learne
2、d that the condition is a【 C1】 _ passed from mothers to sons. If they had a boy, he would have a 50 per cent chance of having the condition. A girl would be【 C2】_. The British couples【 C3】 _ about gender selection led them to Virginia, US where a new sperm (精子 )-separation technique, called MicroSor
3、t, was under【 C4】_ When MiShel became pregnant, she gave birth to a daughter. They will try to have a second daughter using the technique later this year. This is not only a【 C5】 _ effective way to select a childs gender. It also brings a host of ethical (伦理的 ) and practical considerations especiall
4、y for the majority of families who use the technique for【 C6】 _ reasons. The clinic offers sex selection for two purposes: to help couples【 C7】 _ passing on a gender-linked【 C8】 _ disease and to allow those who already have a child to “balance“ their family by having a baby of the opposite sex. The
5、technology is still【 C9】 _ However, Blauer says the company has an【 C10】 _ success rate: 91 per cent of the women who become pregnant after sorting for a girl are successful, while 76 per cent who sort for a boy and get pregnant are successful. A) genetic B) overlapped C) impressive D) unaffected E)
6、 perpetually F) investigation G) inquiries H) feats I) disorder J) gropes K) experimental L) seemingly M) elicit N) nonmedical O) avoid 1 【 C1】 2 【 C2】 3 【 C3】 4 【 C4】 5 【 C5】 6 【 C6】 7 【 C7】 8 【 C8】 9 【 C9】 10 【 C10】 10 Its a good idea to apply sunscreen before heading to the beach if you dont want
7、 to burn. But for marine animals like whales, they dont have that【 C1】 _ Species like sperm whales can spend up to six hours at the oceans surface in between dives,【 C2】_ in the sunlight. So how do they protect themselves from a serious case of sunburn? It turns out that their bodies have a similar
8、defense【 C3】 _ against the suns UV radiation as people. Blue whales which have the lightest skin color of the three species tan during their summer stay before【 C4】 _ back to their northern feeding grounds. Sperm whales dont tan. They can receive an “overdose“ of UV radiation during their hours at t
9、he oceans surface, and they have proteins that【 C5】_ protect their cells from UV damage. This process is【 C6】 _ to how human bodies produce antioxidants in response to molecules that can cause a lot of genetic and cellular damage. And fin whales escape sun damage thanks to their high levels of melan
10、in a dark substance in the skin to protect humans from UV radiation. Older whales and whales with less【 C7】 _ of melanin in their skin like blue whales had the greatest level of damage in their mtDNA. Fin whales, which had the greatest amount of melanin, had the least amount of mtDNA damage. Now tha
11、t the ozone layer that shields Earth from UV radiation is gradually【 C8】_ its important to know what the consequences are for whales and dolphins, especially for【 C9】 _ or endangered species. Although its difficult to tell what causes many of these skin conditions, UV damage is one cause. Even thoug
12、h whales have【 C10】 _ defenses to UV radiation, high exposure can still be harmful. A) similar B) diminishing C) liability D) migrating E) mutual F) mechanism G) effectively H) jerking I) instantaneously J) vulnerable K) content L) baking M) inherent N) perspective O) option 11 【 C1】 12 【 C2】 13 【 C
13、3】 14 【 C4】 15 【 C5】 16 【 C6】 17 【 C7】 18 【 C8】 19 【 C9】 20 【 C10】 20 If you didnt know any better, you might think that Star, Snuppy, CC and ANDi were just a bunch of interesting names. Youd only be half right These creative names【 C1】 _ belong to a pig, a dog, a cat and a monkey that were among th
14、e first clones of their species. Youre likely already familiar with Dolly the sheep that achieved near【 C2】 _ status as the first mammal to be cloned successfully using adult animal cells. But Dolly is not alone. The worlds first clone a tadpole was actually created as early as in 1952. And at least
15、 a dozen different species have been cloned since: everything from the common cow to the【 C3】 _ guar, a type of wild ox. Animal cloning has come a long way since that first tadpole more than 50 years ago. The U.S. Food and Drug Administrations (FDA) declaration in early 2008 that food products【 C4】
16、_ from the clones of cows, pigs and goats are safe for human consumption【 C5】 _ an already growing interest in the process. Cloning may have【 C6】 _ uses besides its ability to help farmers【 C7】_ breed quality burgers and bacon. Other potential uses【 C8】 _ the preservation of species, biomedical rese
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